How do you know if your reader is any good?
Does your reader only give you negative feedback? That might be okay, but it won’t tell you what you’re good at.
Does your reader only give you positive feedback? That might feel great, but it’s not going to help you improve your writing.
To me the best reader gives me both positive and negative feedback. The positive keeps me motivated and tells me what I can relax about. The negative tells me what I need to work on.
What type of feedback do you like to receive and how does it help you?